One-dimensional terahertz dielectric gradient metasurface for broadband spoof surface plasmon polaritons couplers

文献类型： 外文期刊

第一作者： Li, Xiang-Jun

作者： Li, Xiang-Jun;Cheng, Gang;Yan, De-Xian;Hou, Xiao-Mei;Qiu, Guo-Hua;Li, Jiu-Sheng;Li, Xiang-Jun;Cheng, Gang;Yan, De-Xian;Hou, Xiao-Mei;Qiu, Guo-Hua;Li, Jiu-Sheng;Yan, De-Xian;Guo, Shi-Hui;Li, Ji-Ning;Zhou, Wei-Dong

作者机构：

期刊名称：OPTICS LETTERS （ 影响因子：3.776； 五年影响因子：3.634 ）

ISSN： 0146-9592

年卷期： 2021 年 46 卷 2 期

页码：

收录情况： SCI

摘要： At present, most of the gradient metasurfaces used to construct surface plasmon polaritons (SPPs)/spoof SPPs (SSPs) couplers are usually compact metal antennas working under reflection and transmission. In reflection mode, meta-couplers link propagating waves and surface waves (SWs), and SWs will undergo significant scattering before coupling to an Eigen SPP in the target system. In transmission mode, metal meta-couplers will encounter complex multilayer designing at the microwave/terahertz region and metal absorption loss at optical frequencies. In this Letter, to the best of our knowledge, a novel design using dielectric gradient metasurfaces instead of metal metasurface couplers is proposed to excite broadband SSPs on the metal groove array. We demonstrate that the well-designed phase dielectric gradient metasurface converts the normal incident terahertz wave to the predetermined angle in the dielectric substrate and then excites the broadband SSPs with the transmission coupling between the dielectric meta-coupler and SSPs surface. This research may open up new avenues in simple and broadband plane dielectric meta-couplers for SSPs in ultra-thin and compact functional devices for versatile applications. (C) 2021 Optical Society of America

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